Intra-plant variation for progress of cell division in developing oat grains: a preliminary study

Rajala, Ari; Peltonen‐Sainio, Pirjo

doi:10.2137/1239099041837987

Cited by 9 publications

(18 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2009). Primary grain outweighs secondary grain in oat ( Avena sativa L), but in contrast to barley and wheat the topmost spikelets tend to produce the heaviest grains in oat (Tibelius and Klinck 1987, Rajala and Peltonen‐Sainio 2004). Interestingly, grain weight potential seems to associate with the time of pollination of the florets in the spike/panicle and in the spikelet as demonstrated for oat and wheat (Rajala and Peltonen‐Sainio, unpublished data).…”

Section: Discussionmentioning

confidence: 99%

Drought Effect on Grain Number and Grain Weight at Spike and Spikelet Level in Six-Row Spring Barley

Rajala

Hakala

Mäkelä

et al. 2010

Journal of Agronomy and Crop Science

Self Cite

View full text Add to dashboard Cite

Water is the primary regulator of yield formation in cereals. The effect of water limitation and its timing on development of yield components were studied in detail at spike and spikelet level in spring barley (Hordeum vulgare L.). An experiment with three watering treatments (control watering, CONT; drought prior to pollination, DR1 and terminal drought, DR2) was set up in a large greenhouse (20 × 30 m). In addition to watering treatments, two NPK fertilizer application rates (0 and 120 kg N ha−1) were used to investigate the fertilizer effect. The drought effect exceeded the effect of fertilizer application for grain number and single grain weight (SGW). DR1 reduced the number of grains, whereas DR2 reduced both SGW and the number of grains. Resuming the watering at pollination (DR1) restored photosynthesis and enhanced grain filling, resulting in almost similar SGW in DR1 and CONT plants. Spikelets in the upper mid‐section of the spike dominated yield formation in all treatments. This was particularly emphasised in DR1 plants as 58 % of the grain yield was produced in spikelets 3–5, whereas in DR2 and CONT plants it was 39 % and 36 %, respectively. Hence, drought prior pollination strongly reduced yielding capacity (=grain number) in apical and basal spikelets. DR1 and DR2 reduced substantially grain yield and grain N yield resulting in low nitrogen use efficiency.

show abstract

Section: Discussionmentioning

confidence: 99%

Drought Effect on Grain Number and Grain Weight at Spike and Spikelet Level in Six-Row Spring Barley

Rajala

Hakala

Mäkelä

et al. 2010

Journal of Agronomy and Crop Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Oat and wheat have different inflorescence structures and the rate of development also differs between the crops. The development in the oat panicle proceeds from the uppermost terminal spikelet downwards to the base of the panicle [1][2][3], while in wheat the inflorescence develops more synchronously [4,5]. In oat the developmental stages of spikelets and timing of pollination differ markedly within the panicle.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Bonnett recorded 18 days for the spikelet initiation phase to reach the basal parts of the panicle [6]. Somewhat shorter intra-panicle durations (7 -12 days) were recorded for pollination [3,6]. In wheat, the development proceeds from the mid-section of the spike towards the apical and basal sections and initiation of the terminal spikelet at the top of the spike terminates the spikelet initiation phase [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The oat panicle probably exhibits greater plasticity to respond to favorable conditions through increased floret and grain set than the wheat spike, which has a terminal spikelet [7]. It also takes a long time for both floral ini-tiation and advance of pollination downwards in the panicle [3,6]. This probably exposes different parts of panicle to various growing conditions during floral development and grain filling, which may result in within panicle heterogeneity in grain weight.…”

Section: Introductionmentioning

confidence: 99%

“…The single grain weight is dependent on the position of the spikelet in the head and on the grain position in the spikelet, the latter being the more important factor in both species. In oat, grains situated at the top or upper section of the panicle are typically slightly heavier than grains produced in the lower section of the panicle, whereas the primary grain clearly outperforms secondary and tertiary grains [3,9,[11][12][13]. In wheat, spikelets situated in the mid-section of the spike produce heavier grains compared with apical and basal spikelets [14][15][16][17], while within the spikelet proximal grains clearly exceed the distal grains in single grain weight [15,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pollination dynamics, grain weight and grain cell number within the inflorescence and spikelet in oat and wheat

Rajala¹,

Peltonen‐Sainio²

2011

View full text Add to dashboard Cite

Oat (Avena sativa L.) and wheat (Triticum aestivum L.) vary in the structure of their inflores-cences and also in how pollination proceeds within the inflorescence. In both species the grain position in the spikelet determines grain weight potential. Primary grains in oat and proximal grains in wheat weigh more than secondary and distal grains. This variation in grain weight can potentially result from differences in post-pollination cell division in the grain. In this study pollination duration and dynamics were analyzed from head samples collected at two-day intervals, starting from the pollination of the most advanced floret. The number of grain cells was determined for individual grains throughout the inflorescence, starting from the pollination event. When mature, grain position in the spikelet and spike was noted and grain weight assessed. Pollination advance in oat proceeded from the uppermost primary floret towards the basal spikelets in ten to eleven days. Within the spikelet, the primary floret was pollinated on average one day earlier than the secondary floret. In wheat, pollination duration was four to five days, starting from the proximal florets in the mid-section of the inflorescence progressing towards the apical and basal spikelets. Proximal florets were pollinated one to two days earlier than distal florets. Maximum cell number in primary grains exceeded that of secondary grains in two oat cultivars. Similarly, primary grains were heavier than secondary grains. Cell number and single grain weight were correlated in terms of grain position in the spikelet (primary – secondary) and cultivar. Oat cultivar Belinda had a higher single grain weight than Fiia, which was also expressed as larger grain cell number. In wheat, proximal grains had higher maximum cell numbers and were also heavier than distal grains. This grain weight gradient was apparent throughout the inflorescence. Consequently, grain cell number is one of the possible regulators of grain-filling capacity in both cereal crops

show abstract

Improving Farming Systems in Northern European Conditions

Peltonen‐Sainio¹,

Rajala²,

Känkänen³

et al. 2009

Crop Physiology

View full text Add to dashboard Cite

Intra-plant variation for progress of cell division in developing oat grains: a preliminary study

Cited by 9 publications

References 18 publications

Drought Effect on Grain Number and Grain Weight at Spike and Spikelet Level in Six-Row Spring Barley

Drought Effect on Grain Number and Grain Weight at Spike and Spikelet Level in Six-Row Spring Barley

Pollination dynamics, grain weight and grain cell number within the inflorescence and spikelet in oat and wheat

Improving Farming Systems in Northern European Conditions

Contact Info

Product

Resources

About